(tumme-write-tags): Add.

[bpt/emacs.git] / lisp / tumme.el

;;; tumme.el --- use dired to browse and manipulate your images
;;
;; Copyright (C) 2005, 2006 Free Software Foundation, Inc.
;;
;; Version: 0.4.11
;; Keywords: multimedia
;; Author: Mathias Dahl <mathias.rem0veth1s.dahl@gmail.com>

;; This file is part of GNU Emacs.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; Commentary:
;;
;; BACKGROUND
;; ==========
;;
;;  I needed a program to browse, organize and tag my pictures.  I got
;; tired of the old gallery program I used as it did not allow
;; multi-file operations easily.  Also, it put things out of my
;; control.  Image viewing programs I tested did not allow multi-file
;; operations or did not do what I wanted it to.
;;
;;  So, I got the idea to use the wonderful functionality of Emacs and
;; `dired' to do it.  It would allow me to do almost anything I wanted,
;; which is basically just to browse all my pictures in an easy way,
;; letting me manipulate and tag them in various ways.  `dired' already
;; provide all the file handling and navigation facilities; I only
;; needed to add some functions to display the images.
;;
;;  I briefly tried out thumbs.el, and although it seemed more
;; powerful than this package, it did not work the way I wanted to.  It
;; was too slow to created thumbnails of all files in a directory (I
;; currently keep all my 2000+ images in the same directory) and
;; browsing the thumbnail buffer was slow too.  tumme.el will not
;; create thumbnails until they are needed and the browsing is done
;; quickly and easily in dired.  I copied a great deal of ideas and
;; code from there though... :)
;;
;;  About the name: tumme means thumb in Swedish and it is used for
;; working with thumbnails, so... :) If you want to know how to
;; pronounce it, go to the page on EmacsWiki and download the .ogg
;; file from there.
;;
;;  `tumme' stores the thumbnail files in `tumme-dir' using the file
;; name format ORIGNAME.thumb.ORIGEXT.  For example
;; ~/.emacs.d/tumme/myimage01.thumb.jpg.  The "database" is for now
;; just a plain text file with the following format:
;;
;; file-name-non-directory;comment:comment-text;tag1;tag2;tag3;...;tagN
;;
;;
;; PREREQUISITES
;; =============
;;
;; * The ImageMagick package.  Currently, `convert' and `mogrify' are
;; used.  Find it here: http://www.imagemagick.org.
;;
;; * For non-lossy rotation of JPEG images, the JpegTRAN program is
;; needed.
;;
;; * For `tumme-get-exif-data' and `tumme-write-exif-data' to work,
;; the command line tool `exiftool' is needed.  It can be found here:
;; http://www.sno.phy.queensu.ca/~phil/exiftool/.  These two functions
;; are, among other things, used for writing comments to image files
;; using `tumme-thumbnail-set-image-description' and to create
;; "unique" file names using `tumme-get-exif-file-name' (used by
;; `tumme-copy-with-exif-file-name').
;;
;;
;; USAGE
;; =====
;;
;; This information has been moved to the manual. Type `C-h r' to open
;; the Emacs manual and go to the node Thumbnails by typing `g
;; Thumbnails RET'.
;;
;; Quickstart: M-x tumme RET DIRNAME RET
;;
;; where DIRNAME is a directory containing image files.
;;
;; LIMITATIONS
;; ===========
;;
;; * Supports all image formats that Emacs and convert supports, but
;; the thumbnails are hard-coded to JPEG format.
;;
;; * WARNING: The "database" format used might be changed so keep a
;; backup of `tumme-db-file' when testing new versions.
;;
;;
;; TODO
;; ====
;;
;; * Support gallery creation when using per-directory thumbnail
;; storage.
;;
;; * Some sort of auto-rotate function based on rotate info in the
;; EXIF data.
;;
;; * Check if exiftool exist before trying to call it to give a better
;; error message.
;;
;; * Investigate if it is possible to also write the tags to the image
;; files.
;;
;; * From thumbs.el: Add an option for clean-up/max-size functionality
;;   for thumbnail directory.
;;
;; * From thumbs.el: Add setroot function.
;;
;; * From thumbs.el: Add image resizing, if useful (tumme's automatic
;;  "image fit" might be enough)
;;
;; * From thumbs.el: Add the "modify" commands (emboss, negate,
;;   monochrome etc).
;;
;; * Asynchronous creation of thumbnails.
;;
;; * Add `tumme-display-thumbs-ring' and functions to cycle that.  Find
;; out which is best, saving old batch just before inserting new, or
;; saving the current batch in the ring when inserting it.  Adding it
;; probably needs rewriting `tumme-display-thumbs' to be more general.
;;
;; * Find some way of toggling on and off really nice keybindings in
;; dired (for example, using C-n or <down> instead of C-S-n).  Richard
;; suggested that we could keep C-t as prefix for tumme commands as it
;; is currently not used in dired.  He also suggested that
;; `dired-next-line' and `dired-previous-line' figure out if tumme is
;; enabled in the current buffer and, if it is, call
;; `tumme-dired-next-line' and `tumme-dired-previous-line',
;; respectively.  Update: This is partly done; some bindings have now
;; been added to dired.
;;
;; * Enhanced gallery creation with basic CSS-support and pagination
;; of tag pages with many pictures.
;;
;; * Rewrite `tumme-modify-mark-on-thumb-original-file' to be less
;; ugly.
;;
;; * In some way keep track of buffers and windows and stuff so that
;; it works as the user expects.
;;
;; * More/better documentation
;;
;;
;;; Code:

(require 'dired)
(require 'format-spec)
(require 'widget)

(eval-when-compile
  (require 'wid-edit))

(defgroup tumme nil
  "Use dired to browse your images as thumbnails, and more."
  :prefix "tumme-"
  :group 'multimedia)

(defcustom tumme-dir "~/.emacs.d/tumme/"
  "*Directory where thumbnail images are stored."
  :type 'string
  :group 'tumme)

(defcustom tumme-thumbnail-storage 'use-tumme-dir
  "*How to store tumme's thumbnail files.
Tumme can store thumbnail files in one of two ways and this is
controlled by this variable.  \"Use tumme dir\" means that the
thumbnails are stored in a central directory.  \"Per directory\"
means that each thumbnail is stored in a subdirectory called
\".tumme\" in the same directory where the image file is.
\"Thumbnail Managing Standard\" means that the thumbnails are
stored and generated according to the Thumbnail Managing Standard
that allows sharing of thumbnails across different programs."
  :type '(choice :tag "How to store thumbnail files"
                 (const :tag "Thumbnail Managing Standard" standard)
                 (const :tag "Use tumme-dir" use-tumme-dir)
                 (const :tag "Per-directory" per-directory))
  :group 'tumme)

(defcustom tumme-db-file "~/.emacs.d/tumme/.tumme_db"
  "*Database file where file names and their associated tags are stored."
  :type 'string
  :group 'tumme)

(defcustom tumme-temp-image-file "~/.emacs.d/tumme/.tumme_temp"
  "*Name of temporary image file used by various commands."
  :type 'string
  :group 'tumme)

(defcustom tumme-gallery-dir "~/.emacs.d/tumme/.tumme_gallery"
  "*Directory to store generated gallery html pages.
This path needs to be \"shared\" to the public so that it can access
the index.html page that tumme creates."
  :type 'string
  :group 'tumme)

(defcustom tumme-gallery-image-root-url
"http://your.own.server/tummepics"
  "*URL where the full size images are to be found.
Note that this path has to be configured in your web server.  Tumme
expects to find pictures in this directory."
  :type 'string
  :group 'tumme)

(defcustom tumme-gallery-thumb-image-root-url
"http://your.own.server/tummethumbs"
  "*URL where the thumbnail images are to be found.
Note that this path has to be configured in your web server.  Tumme
expects to find pictures in this directory."
  :type 'string
  :group 'tumme)

(defcustom tumme-cmd-create-thumbnail-program
  "convert"
  "*Executable used to create thumbnail.
Used together with `tumme-cmd-create-thumbnail-options'."
  :type 'string
  :group 'tumme)

(defcustom tumme-cmd-create-thumbnail-options
  "%p -size %wx%h \"%f\" -resize %wx%h +profile \"*\" jpeg:\"%t\""
  "*Format of command used to create thumbnail image.
Available options are %p which is replaced by
`tumme-cmd-create-thumbnail-program', %w which is replaced by
`tumme-thumb-width', %h which is replaced by `tumme-thumb-height',
%f which is replaced by the file name of the original image and %t
which is replaced by the file name of the thumbnail file."
  :type 'string
  :group 'tumme)

(defcustom tumme-cmd-create-temp-image-program
  "convert"
  "*Executable used to create temporary image.
Used together with `tumme-cmd-create-temp-image-options'."
  :type 'string
  :group 'tumme)

(defcustom tumme-cmd-create-temp-image-options
  "%p -size %wx%h \"%f\" -resize %wx%h +profile \"*\" jpeg:\"%t\""
  "*Format of command used to create temporary image for display window.
Available options are %p which is replaced by
`tumme-cmd-create-temp-image-program', %w and %h which is replaced by
the calculated max size for width and height in the image display window,
%f which is replaced by the file name of the original image and %t which
is replaced by the file name of the temporary file."
  :type 'string
  :group 'tumme)

(defcustom tumme-cmd-pngnq-program (executable-find "pngnq")
  "*The file name of the `pngnq' program.
It quantizes colors of PNG images down to 256 colors."
  :type '(choice (const :tag "Not Set" nil) string)
  :group 'tumme)

(defcustom tumme-cmd-pngcrush-program (executable-find "pngcrush")
  "*The file name of the `pngcrush' program.
It optimizes the compression of PNG images.  Also it adds PNG textual chunks
with the information required by the Thumbnail Managing Standard."
  :type '(choice (const :tag "Not Set" nil) string)
  :group 'tumme)

(defcustom tumme-cmd-create-standard-thumbnail-command
  (concat
   tumme-cmd-create-thumbnail-program " "
   "-size %wx%h \"%f\" "
   (unless (or tumme-cmd-pngcrush-program tumme-cmd-pngnq-program)
     (concat
      "-set \"Thumb::MTime\" \"%m\" "
      "-set \"Thumb::URI\" \"file://%f\" "
      "-set \"Description\" \"Thumbnail of file://%f\" "
      "-set \"Software\" \"" (emacs-version) "\" "))
   "-thumbnail %wx%h png:\"%t\""
   (if tumme-cmd-pngnq-program
       (concat
        " ; " tumme-cmd-pngnq-program " -f \"%t\""
        (unless tumme-cmd-pngcrush-program
          " ; mv %q %t")))
   (if tumme-cmd-pngcrush-program
       (concat
        (unless tumme-cmd-pngcrush-program
          " ; cp %t %q")
        " ; " tumme-cmd-pngcrush-program " -q "
        "-text b \"Description\" \"Thumbnail of file://%f\" "
        "-text b \"Software\" \"" (emacs-version) "\" "
        ;; "-text b \"Thumb::Image::Height\" \"%oh\" "
        ;; "-text b \"Thumb::Image::Mimetype\" \"%mime\" "
        ;; "-text b \"Thumb::Image::Width\" \"%ow\" "
        "-text b \"Thumb::MTime\" \"%m\" "
        ;; "-text b \"Thumb::Size\" \"%b\" "
        "-text b \"Thumb::URI\" \"file://%f\" "
        "%q %t"
        " ; rm %q")))
  "*Command to create thumbnails according to the Thumbnail Managing Standard."
  :type 'string
  :group 'tumme)

(defcustom tumme-cmd-rotate-thumbnail-program
  "mogrify"
  "*Executable used to rotate thumbnail.
Used together with `tumme-cmd-rotate-thumbnail-options'."
  :type 'string
  :group 'tumme)

(defcustom tumme-cmd-rotate-thumbnail-options
  "%p -rotate %d \"%t\""
  "*Format of command used to rotate thumbnail image.
Available options are %p which is replaced by
`tumme-cmd-rotate-thumbnail-program', %d which is replaced by the
number of (positive) degrees to rotate the image, normally 90 or 270
\(for 90 degrees right and left), %t which is replaced by the file name
of the thumbnail file."
  :type 'string
  :group 'tumme)

(defcustom tumme-cmd-rotate-original-program
  "jpegtran"
  "*Executable used to rotate original image.
Used together with `tumme-cmd-rotate-original-options'."
  :type 'string
  :group 'tumme)

(defcustom tumme-cmd-rotate-original-options
  "%p -rotate %d -copy all \"%o\" > %t"
  "*Format of command used to rotate original image.
Available options are %p which is replaced by
`tumme-cmd-rotate-original-program', %d which is replaced by the
number of (positive) degrees to rotate the image, normally 90 or
270 \(for 90 degrees right and left), %o which is replaced by the
original image file name and %t which is replaced by
`tumme-temp-image-file'."
  :type 'string
  :group 'tumme)

(defcustom tumme-temp-rotate-image-file
  "~/.emacs.d/tumme/.tumme_rotate_temp"
  "*Temporary file for rotate operations."
  :type 'string
  :group 'tumme)

(defcustom tumme-rotate-original-ask-before-overwrite t
  "Confirm overwrite of original file after rotate operation.
If non-nil, ask user for confirmation before overwriting the
original file with `tumme-temp-rotate-image-file'."
  :type 'boolean
  :group 'tumme)

(defcustom tumme-cmd-write-exif-data-program
  "exiftool"
  "*Program used to write EXIF data to image.
Used together with `tumme-cmd-write-exif-data-options'."
  :type 'string
  :group 'tumme)

(defcustom tumme-cmd-write-exif-data-options
  "%p -%t=\"%v\" \"%f\""
  "*Format of command used to write EXIF data.
Available options are %p which is replaced by
`tumme-cmd-write-exif-data-program', %f which is replaced by the
image file name, %t which is replaced by the tag name and %v
which is replaced by the tag value."
  :type 'string
  :group 'tumme)

(defcustom tumme-cmd-read-exif-data-program
  "exiftool"
  "*Program used to read EXIF data to image.
Used together with `tumme-cmd-read-exif-data-program-options'."
  :type 'string
  :group 'tumme)

(defcustom tumme-cmd-read-exif-data-options
  "%p -s -s -s -%t \"%f\""
  "*Format of command used to read EXIF data.
Available options are %p which is replaced by
`tumme-cmd-write-exif-data-options', %f which is replaced
by the image file name and %t which is replaced by the tag name."
  :type 'string
  :group 'tumme)

(defcustom tumme-gallery-hidden-tags
  (list "private" "hidden" "pending")
  "*List of \"hidden\" tags.
Used by `tumme-gallery-generate' to leave out \"hidden\" images."
  :type '(repeat string)
  :group 'tumme)

(defcustom tumme-thumb-size (if (eq 'standard tumme-thumbnail-storage) 128 100)
  "Size of thumbnails, in pixels.
This is the default size for both `tumme-thumb-width' and `tumme-thumb-height'."
  :type 'integer
  :group 'tumme)

(defcustom tumme-thumb-width tumme-thumb-size
  "Width of thumbnails, in pixels."
  :type 'integer
  :group 'tumme)

(defcustom tumme-thumb-height tumme-thumb-size
  "Height of thumbnails, in pixels."
  :type 'integer
  :group 'tumme)

(defcustom tumme-thumb-relief 2
  "*Size of button-like border around thumbnails."
  :type 'integer
  :group 'tumme)

(defcustom tumme-thumb-margin 2
  "*Size of the margin around thumbnails.
This is where you see the cursor."
  :type 'integer
  :group 'tumme)

(defcustom tumme-line-up-method 'dynamic
  "*Default method for line-up of thumbnails in thumbnail buffer.
Used by `tumme-display-thumbs' and other functions that needs to
line-up thumbnails.  Dynamic means to use the available width of the
window containing the thumbnail buffer, Fixed means to use
`tumme-thumbs-per-row', Interactive is for asking the user, and No
line-up means that no automatic line-up will be done."
  :type '(choice :tag "Default line-up method"
                 (const :tag "Dynamic" dynamic)
                 (const :tag "Fixed" fixed)
                 (const :tag "Interactive" interactive)
                 (const :tag "No line-up" none))
  :group 'tumme)

(defcustom tumme-thumbs-per-row 3
  "*Number of thumbnails to display per row in thumb buffer."
  :type 'integer
  :group 'tumme)

(defcustom tumme-display-window-width-correction 1
  "*Number to be used to correct image display window width.
Change if the default (1) does not work (i.e. if the image does not
completely fit)."
  :type 'integer
  :group 'tumme)

(defcustom tumme-display-window-height-correction 0
  "*Number to be used to correct image display window height.
Change if the default (0) does not work (i.e. if the image does not
completely fit)."
  :type 'integer
  :group 'tumme)

(defcustom tumme-track-movement t
  "The current state of the tracking and mirroring.
For more information, see the documentation for
`tumme-toggle-movement-tracking'."
  :type 'boolean
  :group 'tumme)

(defcustom tumme-append-when-browsing nil
  "Append thumbnails in thumbnail buffer when browsing.
If non-nil, using `tumme-next-line-and-display' and
`tumme-previous-line-and-display' will leave a trail of thumbnail
images in the thumbnail buffer.  If you enable this and want to clean
the thumbnail buffer because it is filled with too many thumbmnails,
just call `tumme-display-thumb' to display only the image at point.
This value can be toggled using `tumme-toggle-append-browsing'."
  :type 'boolean
  :group 'tumme)

(defcustom tumme-dired-disp-props t
  "If non-nil, display properties for dired file when browsing.
Used by `tumme-next-line-and-display',
`tumme-previous-line-and-display' and `tumme-mark-and-display-next'.
If the database file is large, this can slow down image browsing in
dired and you might want to turn it off."
  :type 'boolean
  :group 'tumme)

(defcustom tumme-display-properties-format "%b: %f (%t): %c"
  "*Display format for thumbnail properties.
%b is replaced with associated dired buffer name, %f with file name
\(without path) of original image file, %t with the list of tags and %c
with the comment."
  :type 'string
  :group 'tumme)

(defcustom tumme-external-viewer
  ;; TODO: Use mailcap, dired-guess-shell-alist-default,
  ;; dired-view-command-alist.
  (cond ((executable-find "display"))
        ((executable-find "xli"))
        ((executable-find "qiv") "qiv -t"))
  "*Name of external viewer.
Including parameters.  Used when displaying original image from
`tumme-thumbnail-mode'."
  :type 'string
  :group 'tumme)

(defcustom tumme-main-image-directory "~/pics/"
  "*Name of main image directory, if any.
Used by `tumme-copy-with-exif-file-name'."
  :type 'string
  :group 'tumme)

(defcustom tumme-show-all-from-dir-max-files 50
  "*Maximum number of files to show using `tumme-show-all-from-dir'.
before warning the user."
  :type 'integer
  :group 'tumme)

(defun tumme-dir ()
  "Return the current thumbnails directory (from variable `tumme-dir').
Create the thumbnails directory if it does not exist."
  (let ((tumme-dir (file-name-as-directory
                    (expand-file-name tumme-dir))))
    (unless (file-directory-p tumme-dir)
      (make-directory tumme-dir t)
      (message "Creating thumbnails directory"))
    tumme-dir))

(defun tumme-insert-image (file type relief margin)
  "Insert image FILE of image TYPE, using RELIEF and MARGIN, at point."

  (let ((i `(image :type ,type
                   :file ,file
                   :relief ,relief
                   :margin ,margin)))
    (insert-image i)))

(defun tumme-get-thumbnail-image (file)
  "Return the image descriptor for a thumbnail of image file FILE."
  (unless (string-match (image-file-name-regexp) file)
    (error "%s is not a valid image file" file))
  (let ((thumb-file (tumme-thumb-name file)))
    (unless (and (file-exists-p thumb-file)
                 (<= (float-time (nth 5 (file-attributes file)))
                     (float-time (nth 5 (file-attributes thumb-file)))))
      (tumme-create-thumb file thumb-file))
    (create-image thumb-file)
;;     (list 'image :type 'jpeg
;;           :file thumb-file
;;        :relief tumme-thumb-relief :margin tumme-thumb-margin)
    ))

(defun tumme-insert-thumbnail (file original-file-name
                                    associated-dired-buffer)
  "Insert thumbnail image FILE.
Add text properties ORIGINAL-FILE-NAME and ASSOCIATED-DIRED-BUFFER."
  (let (beg end)
    (setq beg (point))
    (tumme-insert-image file
                        ;; TODO: this should depend on the real file type
                        (if (eq 'standard tumme-thumbnail-storage)
                            'png 'jpeg)
                        tumme-thumb-relief
                        tumme-thumb-margin)
    (setq end (point))
    (add-text-properties
     beg end
     (list 'tumme-thumbnail t
           'original-file-name original-file-name
           'associated-dired-buffer associated-dired-buffer
           'tags (tumme-list-tags original-file-name)
           'mouse-face 'highlight
           'comment (tumme-get-comment original-file-name)))))

(defun tumme-thumb-name (file)
  "Return thumbnail file name for FILE.
Depending on the value of `tumme-thumbnail-storage', the file
name will vary.  For central thumbnail file storage, make a
MD5-hash of the image file's directory name and add that to make
the thumbnail file name unique.  For per-directory storage, just
add a subdirectory.  For standard storage, produce the file name
according to the Thumbnail Managing Standard."
  (cond ((eq 'standard tumme-thumbnail-storage)
         (expand-file-name
          (concat "~/.thumbnails/normal/"
                  (md5 (concat "file://" (expand-file-name file))) ".png")))
        ((eq 'use-tumme-dir tumme-thumbnail-storage)
         (let* ((f (expand-file-name file))
                (md5-hash
                 ;; Is MD5 hashes fast enough? The checksum of a
                 ;; thumbnail file name need not be that
                 ;; "cryptographically" good so a faster one could
                 ;; be used here.
                 (md5 (file-name-as-directory (file-name-directory f)))))
           (format "%s%s%s.thumb.%s"
                   (file-name-as-directory (expand-file-name (tumme-dir)))
                   (file-name-sans-extension (file-name-nondirectory f))
                   (if md5-hash (concat "_" md5-hash) "")
                   (file-name-extension f))))
        ((eq 'per-directory tumme-thumbnail-storage)
         (let ((f (expand-file-name file)))
           (format "%s.tumme/%s.thumb.%s"
                   (file-name-directory f)
                   (file-name-sans-extension (file-name-nondirectory f))
                   (file-name-extension f))))))

(defun tumme-create-thumb (original-file thumbnail-file)
  "For ORIGINAL-FILE, create thumbnail image named THUMBNAIL-FILE."
  (let* ((width (int-to-string tumme-thumb-width))
         (height (int-to-string tumme-thumb-height))
         (modif-time (format "%.0f" (float-time (nth 5 (file-attributes
                                                        original-file)))))
         (thumbnail-nq8-file (replace-regexp-in-string ".png\\'" "-nq8.png"
                                                       thumbnail-file))
         (command
          (format-spec
           (if (eq 'standard tumme-thumbnail-storage)
               tumme-cmd-create-standard-thumbnail-command
             tumme-cmd-create-thumbnail-options)
           (list
            (cons ?p tumme-cmd-create-thumbnail-program)
            (cons ?w width)
            (cons ?h height)
            (cons ?m modif-time)
            (cons ?f original-file)
            (cons ?q thumbnail-nq8-file)
            (cons ?t thumbnail-file))))
         thumbnail-dir)
    (when (not (file-exists-p
                (setq thumbnail-dir (file-name-directory thumbnail-file))))
      (message "Creating thumbnail directory.")
      (make-directory thumbnail-dir))
    (call-process shell-file-name nil nil nil shell-command-switch command)))

;;;###autoload
(defun tumme-dired-insert-marked-thumbs ()
  "Insert thumbnails before file names of marked files in the dired buffer."
  (interactive)
  (dired-map-over-marks
   (let* ((image-pos (dired-move-to-filename))
          (image-file (dired-get-filename))
          (thumb-file (tumme-get-thumbnail-image image-file))
          overlay)
     ;; If image is not already added, then add it.
     (unless (delq nil (mapcar (lambda (o) (overlay-get o 'put-image))
                               ;; Can't use (overlays-at (point)), BUG?
                               (overlays-in (point) (1+ (point)))))
       (put-image thumb-file image-pos)
       (setq 
        overlay
        (car (delq nil (mapcar (lambda (o) (and (overlay-get o 'put-image) o))
                               (overlays-in (point) (1+ (point)))))))
       (overlay-put overlay 'image-file image-file)
       (overlay-put overlay 'thumb-file thumb-file)))
   nil)
  (add-hook 'dired-after-readin-hook 'tumme-dired-after-readin-hook nil t))

(defun tumme-dired-after-readin-hook ()
  "Relocate existing thumbnail overlays in dired buffer after reverting.
Move them to their corresponding files if they are still exist.
Otherwise, delete overlays."
  (mapc (lambda (overlay)
          (when (overlay-get overlay 'put-image)
            (let* ((image-file (overlay-get overlay 'image-file))
                   (image-pos (dired-goto-file image-file)))
              (if image-pos
                  (move-overlay overlay image-pos image-pos)
                (delete-overlay overlay)))))
        (overlays-in (point-min) (point-max))))

(defun tumme-next-line-and-display ()
  "Move to next dired line and display thumbnail image."
  (interactive)
  (dired-next-line 1)
  (tumme-display-thumbs
   t (or tumme-append-when-browsing nil) t)
  (if tumme-dired-disp-props
      (tumme-dired-display-properties)))

(defun tumme-previous-line-and-display ()
  "Move to previous dired line and display thumbnail image."
  (interactive)
  (dired-previous-line 1)
  (tumme-display-thumbs
   t (or tumme-append-when-browsing nil) t)
  (if tumme-dired-disp-props
      (tumme-dired-display-properties)))

(defun tumme-toggle-append-browsing ()
  "Toggle `tumme-append-when-browsing'."
  (interactive)
  (setq tumme-append-when-browsing
        (not tumme-append-when-browsing))
  (message "Append browsing %s."
           (if tumme-append-when-browsing
               "on"
             "off")))

(defun tumme-mark-and-display-next ()
  "Mark current file in dired and display next thumbnail image."
  (interactive)
  (dired-mark 1)
  (tumme-display-thumbs
   t (or tumme-append-when-browsing nil) t)
  (if tumme-dired-disp-props
      (tumme-dired-display-properties)))

(defun tumme-toggle-dired-display-properties ()
  "Toggle `tumme-dired-disp-props'."
  (interactive)
  (setq tumme-dired-disp-props
        (not tumme-dired-disp-props))
  (message "Dired display properties %s."
           (if tumme-dired-disp-props
               "on"
             "off")))

(defvar tumme-thumbnail-buffer "*tumme*"
  "Tumme's thumbnail buffer.")

(defun tumme-create-thumbnail-buffer ()
  "Create thumb buffer and set `tumme-thumbnail-mode'."
  (let ((buf (get-buffer-create tumme-thumbnail-buffer)))
    (with-current-buffer buf
      (setq buffer-read-only t)
      (if (not (eq major-mode 'tumme-thumbnail-mode))
          (tumme-thumbnail-mode)))
    buf))

(defvar tumme-display-image-buffer "*tumme-display-image*"
  "Where larger versions of the images are display.")

(defun tumme-create-display-image-buffer ()
  "Create image display buffer and set `tumme-display-image-mode'."
  (let ((buf (get-buffer-create tumme-display-image-buffer)))
    (with-current-buffer buf
      (setq buffer-read-only t)
      (if (not (eq major-mode 'tumme-display-image-mode))
          (tumme-display-image-mode)))
    buf))

(defvar tumme-saved-window-configuration nil
  "Saved window configuration.")

;;;###autoload
(defun tumme-dired-with-window-configuration (dir &optional arg)
  "Open directory DIR and create a default window configuration.

Convenience command that:

 - Opens dired in folder DIR
 - Splits windows in most useful (?) way
 - Set `truncate-lines' to t

After the command has finished, you would typically mark some
image files in dired and type
\\[tumme-display-thumbs] (`tumme-display-thumbs').

If called with prefix argument ARG, skip splitting of windows.

The current window configuration is saved and can be restored by
calling `tumme-restore-window-configuration'."
  (interactive "DDirectory: \nP")
  (let ((buf (tumme-create-thumbnail-buffer))
        (buf2 (tumme-create-display-image-buffer)))
    (setq tumme-saved-window-configuration
          (current-window-configuration))
    (dired dir)
    (delete-other-windows)
    (when (not arg)
      (split-window-horizontally)
      (setq truncate-lines t)
      (save-excursion
        (other-window 1)
        (switch-to-buffer buf)
        (split-window-vertically)
        (other-window 1)
        (switch-to-buffer buf2)
        (other-window -2)))))

(defun tumme-restore-window-configuration ()
  "Restore window configuration.
Restore any changes to the window configuration made by calling
`tumme-dired-with-window-configuration'."
  (interactive)
  (if tumme-saved-window-configuration
      (set-window-configuration tumme-saved-window-configuration)
    (message "No saved window configuration")))

;;;###autoload
(defun tumme-display-thumbs (&optional arg append do-not-pop)
  "Display thumbnails of all marked files, in `tumme-thumbnail-buffer'.
If a thumbnail image does not exist for a file, it is created on the
fly.  With prefix argument ARG, display only thumbnail for file at
point (this is useful if you have marked some files but want to show
another one).

Recommended usage is to split the current frame horizontally so that
you have the dired buffer in the left window and the
`tumme-thumbnail-buffer' buffer in the right window.

With optional argument APPEND, append thumbnail to thumbnail buffer
instead of erasing it first.

Option argument DO-NOT-POP controls if `pop-to-buffer' should be
used or not.  If non-nil, use `display-buffer' instead of
`pop-to-buffer'.  This is used from functions like
`tumme-next-line-and-display' and
`tumme-previous-line-and-display' where we do not want the
thumbnail buffer to be selected."
  (interactive "P")
  (let ((buf (tumme-create-thumbnail-buffer))
        curr-file thumb-name files count dired-buf beg)
    (if arg
        (setq files (list (dired-get-filename)))
      (setq files (dired-get-marked-files)))
    (setq dired-buf (current-buffer))
    (with-current-buffer buf
      (let ((inhibit-read-only t))
        (if (not append)
            (erase-buffer)
          (goto-char (point-max)))
        (mapcar
         (lambda (curr-file)
           (setq thumb-name (tumme-thumb-name curr-file))
           (if (and (not (file-exists-p thumb-name))
                    (not (= 0 (tumme-create-thumb curr-file thumb-name))))
               (message "Thumb could not be created for file %s" curr-file)
             (tumme-insert-thumbnail thumb-name curr-file dired-buf)))
         files))
      (cond ((eq 'dynamic tumme-line-up-method)
             (tumme-line-up-dynamic))
            ((eq 'fixed tumme-line-up-method)
             (tumme-line-up))
            ((eq 'interactive tumme-line-up-method)
             (tumme-line-up-interactive))
            ((eq 'none tumme-line-up-method)
             nil)
            (t
             (tumme-line-up-dynamic))))
    (if do-not-pop
        (display-buffer tumme-thumbnail-buffer)
      (pop-to-buffer tumme-thumbnail-buffer))))

;;;###autoload
(defun tumme-show-all-from-dir (dir)
  "Make a preview buffer for all images in DIR and display it.
If the number of files in DIR matching `image-file-name-regexp'
exceeds `tumme-show-all-from-dir-max-files', a warning will be
displayed."
  (interactive "DDir: ")
  (dired dir)
  (dired-mark-files-regexp (image-file-name-regexp))
  (let ((files (dired-get-marked-files)))
    (if (or (<= (length files) tumme-show-all-from-dir-max-files)
            (and (> (length files) tumme-show-all-from-dir-max-files)
                 (y-or-n-p
                  (format
                   "Directory contains more than %d image files.  Proceed? "
                   tumme-show-all-from-dir-max-files))))
        (progn
          (tumme-display-thumbs)
          (pop-to-buffer tumme-thumbnail-buffer))
      (message "Cancelled."))))

;;;###autoload
(defalias 'tumme 'tumme-show-all-from-dir)

(defun tumme-write-tag (files tag)
  "For all FILES, writes TAG to the image database."
  (save-excursion
    (let (end buf)
      (setq buf (find-file tumme-db-file))
      (if (not (listp files))
          (if (stringp files)
              (setq files (list files))
            (error "Files must be a string or a list of strings!")))
      (mapcar
       (lambda (file)
         (goto-char (point-min))
         (if (search-forward-regexp
              (format "^%s" file) nil t)
             (progn
               (end-of-line)
               (setq end (point))
               (beginning-of-line)
               (when (not (search-forward (format ";%s" tag) end t))
                 (end-of-line)
                 (insert (format ";%s" tag))))
           (goto-char (point-max))
           (insert (format "\n%s;%s" file tag))))
       files)
      (save-buffer)
      (kill-buffer buf))))

(defun tumme-write-tags (file-tags)
  "Write file tags to database.
Write each file and tag in FILE-TAGS to the database.  FILE-TAGS
is an alist in the following form:
 ((FILE . TAG) ... )"
  (let (end file tag)
    (with-temp-file tumme-db-file
      (insert-file-contents tumme-db-file)
      (dolist (elt file-tags)
        (setq file (car elt)
              tag (cdr elt))
        (goto-char (point-min))
        (if (search-forward-regexp (format "^%s.*$" file) nil t)
            (progn
              (setq end (point))
              (beginning-of-line)
              (when (not (search-forward (format ";%s" tag) end t))
                (end-of-line)
                (insert (format ";%s" tag))))
          (goto-char (point-max))
          (insert (format "\n%s;%s" file tag)))))))

(defun tumme-remove-tag (files tag)
  "For all FILES, remove TAG from the image database."
  (save-excursion
    (let (end buf start)
      (setq buf (find-file tumme-db-file))
      (if (not (listp files))
          (if (stringp files)
              (setq files (list files))
            (error "Files must be a string or a list of strings!")))
      (mapcar
       (lambda (file)
         (goto-char (point-min))
         (when (search-forward-regexp
                (format "^%s" file) nil t)
           (end-of-line)
           (setq end (point))
           (beginning-of-line)
           (when (search-forward-regexp (format "\\(;%s\\)" tag) end t)
             (delete-region (match-beginning 1) (match-end 1))
             ;; Check if file should still be in the database. If
             ;; it has no tags or comments, it will be removed.
             (end-of-line)
             (setq end (point))
             (beginning-of-line)
             (when (not (search-forward ";" end t))
               (kill-line 1)
               ;; If on empty line at end of buffer
               (when (and (eobp)
                          (looking-at "^$"))
                 (delete-backward-char 1))))))
       files)
      (save-buffer)
      (kill-buffer buf))))

(defun tumme-list-tags (file)
  "Read all tags for image FILE from the image database."
  (save-excursion
    (let (end buf (tags ""))
      (setq buf (find-file tumme-db-file))
      (goto-char (point-min))
      (when (search-forward-regexp
             (format "^%s" file) nil t)
        (end-of-line)
        (setq end (point))
        (beginning-of-line)
        (if (search-forward ";" end t)
            (if (search-forward "comment:" end t)
                (if (search-forward ";" end t)
                    (setq tags (buffer-substring (point) end)))
              (setq tags (buffer-substring (point) end)))))
      (kill-buffer buf)
      (split-string tags ";"))))

;;;###autoload
(defun tumme-tag-files (arg)
  "Tag marked file(s) in dired.  With prefix ARG, tag file at point."
  (interactive "P")
  (let ((tag (read-string "Tags to add (separate tags with a semicolon): "))
        curr-file files)
    (if arg
        (setq files (dired-get-filename))
      (setq files (dired-get-marked-files)))
    (tumme-write-tag files tag)))

(defun tumme-tag-thumbnail ()
  "Tag current thumbnail."
  (interactive)
  (let ((tag (read-string "Tags to add (separate tags with a semicolon): ")))
    (tumme-write-tag (tumme-original-file-name) tag))
  (tumme-update-property
   'tags (tumme-list-tags (tumme-original-file-name))))

;;;###autoload
(defun tumme-delete-tag (arg)
  "Remove tag for selected file(s).
With prefix argument ARG, remove tag from file at point."
  (interactive "P")
  (let ((tag (read-string "Tag to remove: "))
        files)
    (if arg
        (setq files (list (dired-get-filename)))
      (setq files (dired-get-marked-files)))
    (tumme-remove-tag files tag)))

(defun tumme-tag-thumbnail-remove ()
  "Remove tag from thumbnail."
  (interactive)
  (let ((tag (read-string "Tag to remove: ")))
    (tumme-remove-tag (tumme-original-file-name) tag))
  (tumme-update-property
   'tags (tumme-list-tags (tumme-original-file-name))))

(defun tumme-original-file-name ()
  "Get original file name for thumbnail or display image at point."
  (get-text-property (point) 'original-file-name))

(defun tumme-associated-dired-buffer ()
  "Get associated dired buffer at point."
  (get-text-property (point) 'associated-dired-buffer))

(defun tumme-get-buffer-window (buf)
  "Return window where buffer BUF is."
  (get-window-with-predicate
   (lambda (window)
     (equal (window-buffer window) buf))
   nil t))

(defun tumme-track-original-file ()
  "Track the original file in the associated dired buffer.
See documentation for `tumme-toggle-movement-tracking'.  Interactive
use only useful if `tumme-track-movement' is nil."
  (interactive)
  (let ((old-buf (current-buffer))
        (dired-buf (tumme-associated-dired-buffer))
        (file-name (tumme-original-file-name)))
    (when (and dired-buf file-name)
      (setq file-name (file-name-nondirectory file-name))
      (set-buffer dired-buf)
      (goto-char (point-min))
      (if (not (search-forward file-name nil t))
          (message "Could not track file")
        (dired-move-to-filename)
        (set-window-point
         (tumme-get-buffer-window dired-buf) (point)))
      (set-buffer old-buf))))

(defun tumme-toggle-movement-tracking ()
  "Turn on and off `tumme-track-movement'.
Tracking of the movements between thumbnail and dired buffer so that
they are \"mirrored\" in the dired buffer.  When this is on, moving
around in the thumbnail or dired buffer will find the matching
position in the other buffer."
  (interactive)
  (setq tumme-track-movement (not tumme-track-movement))
  (message "Tracking %s" (if tumme-track-movement "on" "off")))

(defun tumme-track-thumbnail ()
  "Track current dired file's thumb in `tumme-thumbnail-buffer'.
This is almost the same as what `tumme-track-original-file' does, but
the other way around."
  (let ((file (dired-get-filename))
        (old-buf (current-buffer))
        prop-val found)
    (when (get-buffer tumme-thumbnail-buffer)
      (set-buffer tumme-thumbnail-buffer)
      (goto-char (point-min))
      (while (and (not (eobp))
                  (not found))
        (if (and (setq prop-val
                       (get-text-property (point) 'original-file-name))
                 (string= prop-val file))
            (setq found t))
        (if (not found)
            (forward-char 1)))
      (when found
        (set-window-point
         (tumme-thumbnail-window) (point))
        (tumme-display-thumb-properties))
      (set-buffer old-buf))))

(defun tumme-dired-next-line (&optional arg)
  "Call `dired-next-line', then track thumbnail.
This can safely replace `dired-next-line'.  With prefix argument, move
ARG lines."
  (interactive "P")
  (dired-next-line (or arg 1))
  (if tumme-track-movement
      (tumme-track-thumbnail)))

(defun tumme-dired-previous-line (&optional arg)
  "Call `dired-previous-line', then track thumbnail.
This can safely replace `dired-previous-line'.  With prefix argument,
move ARG lines."
  (interactive "P")
  (dired-previous-line (or arg 1))
  (if tumme-track-movement
      (tumme-track-thumbnail)))

(defun tumme-forward-char ()
  "Move to next image and display properties."
  (interactive)
  ;; Before we move, make sure that there is an image two positions
  ;; forward.
  (when (save-excursion
        (forward-char 2)
        (tumme-image-at-point-p))
    (forward-char)
    (while (and (not (eobp))
                (not (tumme-image-at-point-p)))
      (forward-char))
    (if tumme-track-movement
        (tumme-track-original-file)))
  (tumme-display-thumb-properties))

(defun tumme-backward-char ()
  "Move to previous image and display properties."
  (interactive)
  (when (not (bobp))
    (backward-char)
    (while (and (not (bobp))
                (not (tumme-image-at-point-p)))
      (backward-char))
    (if tumme-track-movement
        (tumme-track-original-file)))
  (tumme-display-thumb-properties))

(defun tumme-next-line ()
  "Move to next line and display properties."
  (interactive)
  (next-line 1)
  ;; If we end up in an empty spot, back up to the next thumbnail.
  (if (not (tumme-image-at-point-p))
      (tumme-backward-char))
  (if tumme-track-movement
      (tumme-track-original-file))
  (tumme-display-thumb-properties))


(defun tumme-previous-line ()
  "Move to previous line and display properties."
  (interactive)
  (previous-line 1)
  ;; If we end up in an empty spot, back up to the next
  ;; thumbnail. This should only happen if the user deleted a
  ;; thumbnail and did not refresh, so it is not very common. But we
  ;; can handle it in a good manner, so why not?
  (if (not (tumme-image-at-point-p))
      (tumme-backward-char))
  (if tumme-track-movement
      (tumme-track-original-file))
  (tumme-display-thumb-properties))

(defun tumme-format-properties-string (buf file props comment)
  "Format display properties.
BUF is the associated dired buffer, FILE is the original image file
name, PROPS is a list of tags and COMMENT is the image files's
comment."
  (format-spec
   tumme-display-properties-format
   (list
    (cons ?b buf)
    (cons ?f file)
    (cons ?t (or (princ props) ""))
    (cons ?c (or comment "")))))

(defun tumme-display-thumb-properties ()
  "Display thumbnail properties in the echo area."
  (if (not (eobp))
      (let ((file-name (file-name-nondirectory (tumme-original-file-name)))
            (dired-buf (buffer-name (tumme-associated-dired-buffer)))
            (props (mapconcat
                    'princ
                    (get-text-property (point) 'tags)
                    ", "))
            (comment (get-text-property (point) 'comment)))
        (if file-name
            (message
             (tumme-format-properties-string
              dired-buf
              file-name
              props
              comment))))))

(defun tumme-dired-file-marked-p ()
  "Check whether file on current line is marked or not."
  (save-excursion
    (beginning-of-line)
    (not (looking-at "^ .*$"))))

(defun tumme-modify-mark-on-thumb-original-file (command)
  "Modify mark in dired buffer.
This is quite ugly but I don't know how to implemented in a better
way.  COMMAND is one of 'mark for marking file in dired, 'unmark for
unmarking file in dired or 'flag for flagging file for delete in
dired."
  (let ((file-name (tumme-original-file-name))
        (dired-buf (tumme-associated-dired-buffer)))
    (if (not (and dired-buf file-name))
        (message "No image, or image with correct properties, at point.")
    (with-current-buffer dired-buf
        (message file-name)
        (setq file-name (file-name-nondirectory file-name))
        (goto-char (point-min))
        (if (search-forward file-name nil t)
            (cond ((eq command 'mark) (dired-mark 1))
                  ((eq command 'unmark) (dired-unmark 1))
                  ((eq command 'toggle)
                   (if (tumme-dired-file-marked-p)
                       (dired-unmark 1)
                     (dired-mark 1)))
                  ((eq command 'flag) (dired-flag-file-deletion 1))))))))

(defun tumme-mark-thumb-original-file ()
  "Mark original image file in associated dired buffer."
  (interactive)
  (tumme-modify-mark-on-thumb-original-file 'mark)
  (tumme-forward-char))

(defun tumme-unmark-thumb-original-file ()
  "Unmark original image file in associated dired buffer."
  (interactive)
  (tumme-modify-mark-on-thumb-original-file 'unmark)
  (tumme-forward-char))

(defun tumme-flag-thumb-original-file ()
  "Flag original image file for deletion in associated dired buffer."
  (interactive)
  (tumme-modify-mark-on-thumb-original-file 'flag)
  (tumme-forward-char))

(defun tumme-toggle-mark-thumb-original-file ()
  "Toggle mark on original image file in associated dired buffer."
  (interactive)
  (tumme-modify-mark-on-thumb-original-file 'toggle))

(defun tumme-jump-original-dired-buffer ()
  "Jump to the dired buffer associated with the current image file.
You probably want to use this together with
`tumme-track-original-file'."
  (interactive)
  (let ((buf (tumme-associated-dired-buffer))
        window frame)
    (setq window (tumme-get-buffer-window buf))
    (if window
        (progn
          (if (not (equal (selected-frame) (setq frame (window-frame window))))
              (select-frame-set-input-focus frame))
          (select-window window))
      (message "Associated dired buffer not visible"))))

;;;###autoload
(defun tumme-jump-thumbnail-buffer ()
  "Jump to thumbnail buffer."
  (interactive)
  (let ((window (tumme-thumbnail-window))
        frame)
    (if window
        (progn
          (if (not (equal (selected-frame) (setq frame (window-frame window))))
              (select-frame-set-input-focus frame))
          (select-window window))
      (message "Thumbnail buffer not visible"))))

(defvar tumme-thumbnail-mode-map (make-sparse-keymap)
  "Keymap for `tumme-thumbnail-mode'.")

(defvar tumme-thumbnail-mode-line-up-map (make-sparse-keymap)
  "Keymap for line-up commands in `tumme-thumbnail-mode'.")

(defvar tumme-thumbnail-mode-tag-map (make-sparse-keymap)
  "Keymap for tag commands in `tumme-thumbnail-mode'.")

(defun tumme-define-thumbnail-mode-keymap ()
  "Define keymap for `tumme-thumbnail-mode'."

  ;; Keys
  (define-key tumme-thumbnail-mode-map [right] 'tumme-forward-char)
  (define-key tumme-thumbnail-mode-map [left] 'tumme-backward-char)
  (define-key tumme-thumbnail-mode-map [up] 'tumme-previous-line)
  (define-key tumme-thumbnail-mode-map [down] 'tumme-next-line)
  (define-key tumme-thumbnail-mode-map "\C-f" 'tumme-forward-char)
  (define-key tumme-thumbnail-mode-map "\C-b" 'tumme-backward-char)
  (define-key tumme-thumbnail-mode-map "\C-p" 'tumme-previous-line)
  (define-key tumme-thumbnail-mode-map "\C-n" 'tumme-next-line)

  (define-key tumme-thumbnail-mode-map "d" 'tumme-flag-thumb-original-file)
  (define-key tumme-thumbnail-mode-map [delete]
    'tumme-flag-thumb-original-file)
  (define-key tumme-thumbnail-mode-map "m" 'tumme-mark-thumb-original-file)
  (define-key tumme-thumbnail-mode-map "u" 'tumme-unmark-thumb-original-file)
  (define-key tumme-thumbnail-mode-map "." 'tumme-track-original-file)
  (define-key tumme-thumbnail-mode-map [tab] 'tumme-jump-original-dired-buffer)

  ;; add line-up map
  (define-key tumme-thumbnail-mode-map "g" tumme-thumbnail-mode-line-up-map)

  ;; map it to "g" so that the user can press it more quickly
  (define-key tumme-thumbnail-mode-line-up-map "g" 'tumme-line-up-dynamic)
  ;; "f" for "fixed" number of thumbs per row
  (define-key tumme-thumbnail-mode-line-up-map "f" 'tumme-line-up)
  ;; "i" for "interactive"
  (define-key tumme-thumbnail-mode-line-up-map "i" 'tumme-line-up-interactive)

  ;; add tag map
  (define-key tumme-thumbnail-mode-map "t" tumme-thumbnail-mode-tag-map)

  ;; map it to "t" so that the user can press it more quickly
  (define-key tumme-thumbnail-mode-tag-map "t" 'tumme-tag-thumbnail)
  ;; "r" for "remove"
  (define-key tumme-thumbnail-mode-tag-map "r" 'tumme-tag-thumbnail-remove)

  (define-key tumme-thumbnail-mode-map "\C-m"
    'tumme-display-thumbnail-original-image)
  (define-key tumme-thumbnail-mode-map [C-return]
    'tumme-thumbnail-display-external)

  (define-key tumme-thumbnail-mode-map "l" 'tumme-rotate-thumbnail-left)
  (define-key tumme-thumbnail-mode-map "r" 'tumme-rotate-thumbnail-right)

  (define-key tumme-thumbnail-mode-map "L" 'tumme-rotate-original-left)
  (define-key tumme-thumbnail-mode-map "R" 'tumme-rotate-original-right)

  (define-key tumme-thumbnail-mode-map "D"
    'tumme-thumbnail-set-image-description)

  (define-key tumme-thumbnail-mode-map "\C-d" 'tumme-delete-char)
  (define-key tumme-thumbnail-mode-map " "
    'tumme-display-next-thumbnail-original)
  (define-key tumme-thumbnail-mode-map
    (kbd "DEL") 'tumme-display-previous-thumbnail-original)
  (define-key tumme-thumbnail-mode-map "c" 'tumme-comment-thumbnail)
  (define-key tumme-thumbnail-mode-map "q" 'tumme-kill-buffer-and-window)

  ;; Mouse
  (define-key tumme-thumbnail-mode-map [mouse-2] 'tumme-mouse-display-image)
  (define-key tumme-thumbnail-mode-map [mouse-1] 'tumme-mouse-select-thumbnail)

  ;; Seems I must first set C-down-mouse-1 to undefined, or else it
  ;; will trigger the buffer menu. If I try to instead bind
  ;; C-down-mouse-1 to `tumme-mouse-toggle-mark', I get a message
  ;; about C-mouse-1 not being defined afterwards. Annoying, but I
  ;; probably do not completely understand mouse events.

  (define-key tumme-thumbnail-mode-map [C-down-mouse-1] 'undefined)
  (define-key tumme-thumbnail-mode-map [C-mouse-1] 'tumme-mouse-toggle-mark)

  ;; Menu
  (define-key tumme-thumbnail-mode-map [menu-bar tumme]
    (cons "Tumme" (make-sparse-keymap "Tumme")))

  (define-key tumme-thumbnail-mode-map
    [menu-bar tumme tumme-kill-buffer-and-window]
    '("Quit" . tumme-kill-buffer-and-window))

  (define-key tumme-thumbnail-mode-map
    [menu-bar tumme tumme-delete-char]
    '("Delete thumbnail from buffer" . tumme-delete-char))

  (define-key tumme-thumbnail-mode-map
    [menu-bar tumme tumme-tag-thumbnail-remove]
    '("Remove tag from thumbnail" . tumme-tag-thumbnail-remove))

  (define-key tumme-thumbnail-mode-map
    [menu-bar tumme tumme-tag-thumbnail]
    '("Tag thumbnail" . tumme-tag-thumbnail))

  (define-key tumme-thumbnail-mode-map
    [menu-bar tumme tumme-comment-thumbnail]
    '("Comment thumbnail" . tumme-comment-thumbnail))

  (define-key tumme-thumbnail-mode-map
    [menu-bar tumme tumme-refresh-thumb]
    '("Refresh thumb" . tumme-refresh-thumb))
  (define-key tumme-thumbnail-mode-map
    [menu-bar tumme tumme-line-up-dynamic]
    '("Dynamic line up" . tumme-line-up-dynamic))
  (define-key tumme-thumbnail-mode-map
    [menu-bar tumme tumme-line-up]
    '("Line up thumbnails" . tumme-line-up))

  (define-key tumme-thumbnail-mode-map
    [menu-bar tumme tumme-rotate-thumbnail-left]
    '("Rotate thumbnail left" . tumme-rotate-thumbnail-left))
  (define-key tumme-thumbnail-mode-map
    [menu-bar tumme tumme-rotate-thumbnail-right]
    '("Rotate thumbnail right" . tumme-rotate-thumbnail-right))

  (define-key tumme-thumbnail-mode-map
    [menu-bar tumme tumme-rotate-original-left]
    '("Rotate original left" . tumme-rotate-original-left))
  (define-key tumme-thumbnail-mode-map
    [menu-bar tumme tumme-rotate-original-right]
    '("Rotate original right" . tumme-rotate-original-right))

  (define-key tumme-thumbnail-mode-map
    [menu-bar tumme tumme-toggle-movement-tracking]
    '("Toggle movement tracking on/off" . tumme-toggle-movement-tracking))

  (define-key tumme-thumbnail-mode-map
    [menu-bar tumme tumme-jump-original-dired-buffer]
    '("Jump to dired buffer" . tumme-jump-original-dired-buffer))
  (define-key tumme-thumbnail-mode-map
    [menu-bar tumme tumme-track-original-file]
    '("Track original" . tumme-track-original-file))

  (define-key tumme-thumbnail-mode-map
    [menu-bar tumme tumme-flag-thumb-original-file]
    '("Flag original for deletion" . tumme-flag-thumb-original-file))
  (define-key tumme-thumbnail-mode-map
    [menu-bar tumme tumme-unmark-thumb-original-file]
    '("Unmark original" . tumme-unmark-thumb-original-file))
  (define-key tumme-thumbnail-mode-map
    [menu-bar tumme tumme-mark-thumb-original-file]
    '("Mark original" . tumme-mark-thumb-original-file))

  (define-key tumme-thumbnail-mode-map
    [menu-bar tumme tumme-thumbnail-display-external]
    '("Display in external viewer" . tumme-thumbnail-display-external))
  (define-key tumme-thumbnail-mode-map
    [menu-bar tumme tumme-display-thumbnail-original-image]
    '("Display image" . tumme-display-thumbnail-original-image)))

(defvar tumme-display-image-mode-map (make-sparse-keymap)
  "Keymap for `tumme-display-image-mode'.")

(defun tumme-define-display-image-mode-keymap ()
  "Define keymap for `tumme-display-image-mode'."

  ;; Keys
  (define-key tumme-display-image-mode-map "q" 'tumme-kill-buffer-and-window)

  (define-key tumme-display-image-mode-map "f"
    'tumme-display-current-image-full)

  (define-key tumme-display-image-mode-map "s"
    'tumme-display-current-image-sized)

  ;; Menu
  (define-key tumme-display-image-mode-map [menu-bar tumme]
    (cons "Tumme" (make-sparse-keymap "Tumme")))

  (define-key tumme-display-image-mode-map
    [menu-bar tumme tumme-kill-buffer-and-window]
    '("Quit" . tumme-kill-buffer-and-window))

  (define-key tumme-display-image-mode-map
    [menu-bar tumme tumme-display-current-image-sized]
    '("Display original, sized to fit" . tumme-display-current-image-sized))

  (define-key tumme-display-image-mode-map
    [menu-bar tumme tumme-display-current-image-full]
    '("Display original, full size" . tumme-display-current-image-full))

  )

(defun tumme-display-current-image-full ()
  "Display current image in full size."
  (interactive)
  (let ((file (tumme-original-file-name)))
    (if file
        (progn
          (tumme-display-image file t)
          (message "Full size image displayed"))
      (error "No original file name at point"))))

(defun tumme-display-current-image-sized ()
  "Display current image in sized to fit window dimensions."
  (interactive)
  (let ((file (tumme-original-file-name)))
    (if file
        (progn
          (tumme-display-image file)
          (message "Full size image displayed"))
      (error "No original file name at point"))))

(define-derived-mode tumme-thumbnail-mode
  fundamental-mode "tumme-thumbnail"
  "Browse and manipulate thumbnail images using dired.
Use `tumme-dired' and `tumme-setup-dired-keybindings' to get a
nice setup to start with."
  (tumme-define-thumbnail-mode-keymap)
  (message "tumme-thumbnail-mode enabled"))

(define-derived-mode tumme-display-image-mode
  fundamental-mode "tumme-image-display"
  "Mode for displaying and manipulating original image.
Resized or in full-size."
  (tumme-define-display-image-mode-keymap)
  (message "tumme-display-image-mode enabled"))

;;;###autoload
(defun tumme-setup-dired-keybindings ()
  "Setup easy-to-use keybindings for the commands to be used in dired mode.
Note that n, p and <down> and <up> will be hijacked and bound to
`tumme-dired-x-line'."
  (interactive)

  ;; Hijack previous and next line movement. Let C-p and C-b be
  ;; though...

  (define-key dired-mode-map "p" 'tumme-dired-previous-line)
  (define-key dired-mode-map "n" 'tumme-dired-next-line)
  (define-key dired-mode-map [up] 'tumme-dired-previous-line)
  (define-key dired-mode-map [down] 'tumme-dired-next-line)

  (define-key dired-mode-map (kbd "C-S-n") 'tumme-next-line-and-display)
  (define-key dired-mode-map (kbd "C-S-p") 'tumme-previous-line-and-display)
  (define-key dired-mode-map (kbd "C-S-m") 'tumme-mark-and-display-next)

  (define-key dired-mode-map "\C-td" 'tumme-display-thumbs)
  (define-key dired-mode-map "\C-tt" 'tumme-tag-files)
  (define-key dired-mode-map "\C-tr" 'tumme-delete-tag)
  (define-key dired-mode-map [tab] 'tumme-jump-thumbnail-buffer)
  (define-key dired-mode-map "\C-ti" 'tumme-dired-display-image)
  (define-key dired-mode-map "\C-tx" 'tumme-dired-display-external)
  (define-key dired-mode-map "\C-ta" 'tumme-display-thumbs-append)
  (define-key dired-mode-map "\C-t." 'tumme-display-thumb)
  (define-key dired-mode-map "\C-tc" 'tumme-dired-comment-files)
  (define-key dired-mode-map "\C-tf" 'tumme-mark-tagged-files)

  ;; Menu for dired
  (define-key dired-mode-map [menu-bar tumme]
    (cons "Tumme" (make-sparse-keymap "Tumme")))

  (define-key dired-mode-map [menu-bar tumme tumme-copy-with-exif-file-name]
    '("Copy with EXIF file name" . tumme-copy-with-exif-file-name))

  (define-key dired-mode-map [menu-bar tumme tumme-dired-comment-files]
    '("Comment files" . tumme-dired-comment-files))

  (define-key dired-mode-map [menu-bar tumme tumme-mark-tagged-files]
    '("Mark tagged files" . tumme-mark-tagged-files))

  (define-key dired-mode-map [menu-bar tumme tumme-delete-tag]
    '("Remove tag from files" . tumme-delete-tag))

  (define-key dired-mode-map [menu-bar tumme tumme-tag-files]
    '("Tag files" . tumme-tag-files))

  (define-key dired-mode-map [menu-bar tumme tumme-jump-thumbnail-buffer]
    '("Jump to thumbnail buffer" . tumme-jump-thumbnail-buffer))

  (define-key dired-mode-map [menu-bar tumme tumme-toggle-movement-tracking]
    '("Toggle movement tracking" . tumme-toggle-movement-tracking))

  (define-key dired-mode-map
    [menu-bar tumme tumme-toggle-append-browsing]
    '("Toggle append browsing" . tumme-toggle-append-browsing))

  (define-key dired-mode-map
    [menu-bar tumme tumme-toggle-disp-props]
    '("Toggle display properties" . tumme-toggle-dired-display-properties))

  (define-key dired-mode-map
    [menu-bar tumme tumme-dired-display-external]
    '("Display in external viewer" . tumme-dired-display-external))
  (define-key dired-mode-map
    [menu-bar tumme tumme-dired-display-image]
    '("Display image" . tumme-dired-display-image))
  (define-key dired-mode-map
    [menu-bar tumme tumme-display-thumb]
    '("Display this thumbnail" . tumme-display-thumb))
  (define-key dired-mode-map
    [menu-bar tumme tumme-display-thumbs-append]
    '("Display thumbnails append" . tumme-display-thumbs-append))
  (define-key dired-mode-map
    [menu-bar tumme tumme-display-thumbs]
    '("Display thumbnails" . tumme-display-thumbs))

  (define-key dired-mode-map
    [menu-bar tumme tumme-create-thumbs]
    '("Create thumbnails for marked files" . tumme-create-thumbs))

  (define-key dired-mode-map
    [menu-bar tumme tumme-mark-and-display-next]
    '("Mark and display next" . tumme-mark-and-display-next))
  (define-key dired-mode-map
    [menu-bar tumme tumme-previous-line-and-display]
    '("Display thumb for previous file" . tumme-previous-line-and-display))
  (define-key dired-mode-map
    [menu-bar tumme tumme-next-line-and-display]
    '("Display thumb for next file" . tumme-next-line-and-display)))

(defun tumme-create-thumbs (&optional arg)
  "Create thumbnail images for all marked files in dired.
With prefix argument ARG, create thumbnails even if they already exist
\(i.e.  use this to refresh your thumbnails)."
  (interactive "P")
  (let (curr-file thumb-name files count)
    (setq files (dired-get-marked-files))
    (mapcar
     (lambda (curr-file)
       (setq thumb-name (tumme-thumb-name curr-file))
       ;; If the user overrides the exist check, we must clear the
       ;; image cache so that if the user wants to display the
       ;; thumnail, it is not fetched from cache.
       (if arg
           (clear-image-cache))
       (if (or (not (file-exists-p thumb-name))
               arg)
           (if (not (= 0 (tumme-create-thumb curr-file
                                             (tumme-thumb-name curr-file))))
               (error "Thumb could not be created"))))
     files)))

(defvar tumme-slideshow-timer nil
  "Slideshow timer.")

(defvar tumme-slideshow-count 0
  "Keeping track on number of images in slideshow.")

(defvar tumme-slideshow-times 0
  "Number of pictures to display in slideshow.")

(defun tumme-slideshow-step ()
  "Step to next file, if `tumme-slideshow-times' has not been reached."
  (if (< tumme-slideshow-count tumme-slideshow-times)
      (progn
        (message "%s" (1+ tumme-slideshow-count))
        (setq tumme-slideshow-count (1+ tumme-slideshow-count))
        (tumme-next-line-and-display))
    (tumme-slideshow-stop)))

(defun tumme-slideshow-start ()
  "Start slideshow.
Ask user for number of images to show and the delay in between."
  (interactive)
  (setq tumme-slideshow-count 0)
  (setq tumme-slideshow-times (string-to-number (read-string "How many: ")))
  (let ((repeat (string-to-number
                 (read-string
                  "Delay, in seconds. Decimals are accepted : " "1"))))
    (setq tumme-slideshow-timer
          (run-with-timer
           0 repeat
           'tumme-slideshow-step))))

(defun tumme-slideshow-stop ()
  "Cancel slideshow."
  (interactive)
  (cancel-timer tumme-slideshow-timer))

(defun tumme-delete-char ()
  "Remove current thumbnail from thumbnail buffer and line up."
  (interactive)
  (let ((inhibit-read-only t))
    (delete-char 1)
    (if (looking-at " ")
        (delete-char 1))))

;;;###autoload
(defun tumme-display-thumbs-append ()
  "Append thumbnails to `tumme-thumbnail-buffer'."
  (interactive)
  (tumme-display-thumbs nil t t))

;;;###autoload
(defun tumme-display-thumb ()
  "Shorthard for `tumme-display-thumbs' with prefix argument."
  (interactive)
  (tumme-display-thumbs t nil t))

(defun tumme-line-up ()
  "Line up thumbnails according to `tumme-thumbs-per-row'.
See also `tumme-line-up-dynamic'."
  (interactive)
  (let ((inhibit-read-only t))
    (goto-char (point-min))
    (while (and (not (tumme-image-at-point-p))
                (not (eobp)))
      (delete-char 1))
    (while (not (eobp))
      (forward-char)
      (while (and (not (tumme-image-at-point-p))
                  (not (eobp)))
        (delete-char 1)))
    (goto-char (point-min))
    (let ((count 0))
      (while (not (eobp))
        (forward-char)
        (if (= tumme-thumbs-per-row 1)
            (insert "\n")
          (insert " ")
          (setq count (1+ count))
          (when (and (= count (- tumme-thumbs-per-row 1))
                     (not (eobp)))
            (forward-char)
            (insert "\n")
            (setq count 0)))))
    (goto-char (point-min))))

(defun tumme-line-up-dynamic ()
  "Line up thumbnails images dynamically.
Calculate how many thumbnails fit."
  (interactive)
  (let* ((char-width (frame-char-width))
        (width (tumme-window-width-pixels (tumme-thumbnail-window)))
        (tumme-thumbs-per-row
         (/ width
            (+ (* 2 tumme-thumb-relief)
               (* 2 tumme-thumb-margin)
               tumme-thumb-width char-width))))
    (tumme-line-up)))

(defun tumme-line-up-interactive ()
  "Line up thumbnails interactively.
Ask user how many thumbnails should be displayed per row."
  (interactive)
  (let ((tumme-thumbs-per-row
         (string-to-number (read-string "How many thumbs per row: "))))
    (if (not (> tumme-thumbs-per-row 0))
        (message "Number must be greater than 0")
      (tumme-line-up))))

(defun tumme-thumbnail-display-external ()
  "Display original image for thumbnail at point using external viewer."
  (interactive)
  (let ((file (tumme-original-file-name)))
    (if (not (tumme-image-at-point-p))
        (message "No thumbnail at point")
      (if (not file)
          (message "No original file name found")
        (call-process shell-file-name nil nil nil shell-command-switch
                      (format "%s \"%s\"" tumme-external-viewer file))))))

;;;###autoload
(defun tumme-dired-display-external ()
  "Display file at point using an external viewer."
  (interactive)
  (let ((file (dired-get-filename)))
    (call-process shell-file-name nil nil nil shell-command-switch
                  (format "%s \"%s\"" tumme-external-viewer file))))

(defun tumme-window-width-pixels (window)
  "Calculate WINDOW width in pixels."
    (* (window-width window) (frame-char-width)))

(defun tumme-window-height-pixels (window)
  "Calculate WINDOW height in pixels."
  ;; Note: The mode-line consumes one line
    (* (- (window-height window) 1) (frame-char-height)))

(defun tumme-display-window ()
  "Return window where `tumme-display-image-buffer' is visible."
  (get-window-with-predicate
   (lambda (window)
     (equal (buffer-name (window-buffer window)) tumme-display-image-buffer))
   nil t))

(defun tumme-thumbnail-window ()
  "Return window where `tumme-thumbnail-buffer' is visible."
  (get-window-with-predicate
   (lambda (window)
     (equal (buffer-name (window-buffer window)) tumme-thumbnail-buffer))
   nil t))

(defun tumme-associated-dired-buffer-window ()
  "Return window where associated dired buffer is visible."
  (let (buf)
    (if (tumme-image-at-point-p)
        (progn
          (setq buf (tumme-associated-dired-buffer))
          (get-window-with-predicate
           (lambda (window)
             (equal (window-buffer window) buf))))
      (error "No thumbnail image at point"))))

(defun tumme-display-window-width ()
  "Return width, in pixels, of tumme's image display window."
  (- (tumme-window-width-pixels (tumme-display-window))
     tumme-display-window-width-correction))

(defun tumme-display-window-height ()
  "Return height, in pixels, of tumme's image display window."
  (- (tumme-window-height-pixels (tumme-display-window))
     tumme-display-window-height-correction))

(defun tumme-display-image (file &optional original-size)
  "Display image FILE in image buffer.
Use this when you want to display the image, semi sized, in a new
window.  The image is sized to fit the display window (using a
temporary file, don't worry).  Because of this, it will not be as
quick as opening it directly, but on most modern systems it
should feel snappy enough.

If optional argument ORIGINAL-SIZE is non-nil, display image in its
original size."
  (let ((new-file (expand-file-name tumme-temp-image-file))
        width height command ret)
    (setq file (expand-file-name file))
    (if (not original-size)
        (progn
          (setq width (tumme-display-window-width))
          (setq height (tumme-display-window-height))
          (setq command
                (format-spec
                 tumme-cmd-create-temp-image-options
                 (list
                  (cons ?p tumme-cmd-create-temp-image-program)
                  (cons ?w width)
                  (cons ?h height)
                  (cons ?f file)
                  (cons ?t new-file))))
          (setq ret (call-process shell-file-name nil nil nil
                                  shell-command-switch command))
          (if (not (= 0 ret))
              (error "Could not resize image")))
      (copy-file file new-file t))
    (with-current-buffer (tumme-create-display-image-buffer)
      (let ((inhibit-read-only t))
        (erase-buffer)
        (clear-image-cache)
        (tumme-insert-image tumme-temp-image-file 'jpeg 0 0)
        (goto-char (point-min))
        (tumme-update-property 'original-file-name file)))))

(defun tumme-display-thumbnail-original-image (&optional arg)
  "Display current thumbnail's original image in display buffer.
See documentation for `tumme-display-image' for more information.
With prefix argument ARG, display image in its original size."
  (interactive "P")
  (let ((file (tumme-original-file-name)))
    (if (not (string-equal major-mode "tumme-thumbnail-mode"))
        (message "Not in tumme-thumbnail-mode")
      (if (not (tumme-image-at-point-p))
          (message "No thumbnail at point")
        (if (not file)
            (message "No original file name found")
          (tumme-create-display-image-buffer)
          (display-buffer tumme-display-image-buffer)
          (tumme-display-image file arg))))))


;;;###autoload
(defun tumme-dired-display-image (&optional arg)
  "Display current image file.
See documentation for `tumme-display-image' for more information.
With prefix argument ARG, display image in its original size."
  (interactive "P")
  (tumme-create-display-image-buffer)
  (display-buffer tumme-display-image-buffer)
  (tumme-display-image (dired-get-filename) arg))

(defun tumme-image-at-point-p ()
  "Return true if there is a tumme thumbnail at point."
  (get-text-property (point) 'tumme-thumbnail))

(defun tumme-rotate-thumbnail (degrees)
  "Rotate thumbnail DEGREES degrees."
  (if (not (tumme-image-at-point-p))
      (message "No thumbnail at point")
    (let ((file (tumme-thumb-name (tumme-original-file-name)))
          command)
      (setq command (format-spec
                     tumme-cmd-rotate-thumbnail-options
                     (list
                      (cons ?p tumme-cmd-rotate-thumbnail-program)
                      (cons ?d degrees)
                      (cons ?t (expand-file-name file)))))
      (call-process shell-file-name nil nil nil shell-command-switch command)
      ;; Clear the cache to refresh image. I wish I could just refresh
      ;; the current file but I do not know how to do that. Yet...
      (clear-image-cache))))

(defun tumme-rotate-thumbnail-left ()
  "Rotate thumbnail left (counter clockwise) 90 degrees.
The result of the rotation is displayed in the image display area
and a confirmation is needed before the original image files is
overwritten.  This confirmation can be turned off using
`tumme-rotate-original-ask-before-overwrite'."
  (interactive)
  (tumme-rotate-thumbnail "270"))

(defun tumme-rotate-thumbnail-right ()
  "Rotate thumbnail counter right (clockwise) 90 degrees.
The result of the rotation is displayed in the image display area
and a confirmation is needed before the original image files is
overwritten.  This confirmation can be turned off using
`tumme-rotate-original-ask-before-overwrite'."
  (interactive)
  (tumme-rotate-thumbnail "90"))

(defun tumme-refresh-thumb ()
  "Force creation of new image for current thumbnail."
  (interactive)
  (let ((file (tumme-original-file-name)))
    (clear-image-cache)
    (tumme-create-thumb file (tumme-thumb-name file))))

(defun tumme-rotate-original (degrees)
  "Rotate original image DEGREES degrees."
  (if (not (tumme-image-at-point-p))
      (message "No image at point")
    (let ((file (tumme-original-file-name))
          command temp-file)
      (if (not (string-match "\.[jJ][pP[eE]?[gG]$" file))
          (error "Only JPEG images can be rotated!"))
      (setq command (format-spec
                     tumme-cmd-rotate-original-options
                     (list
                      (cons ?p tumme-cmd-rotate-original-program)
                      (cons ?d degrees)
                      (cons ?o (expand-file-name file))
                      (cons ?t tumme-temp-rotate-image-file))))
      (if (not (= 0 (call-process shell-file-name nil nil nil
                                  shell-command-switch command)))
          (error "Could not rotate image")
        (tumme-display-image tumme-temp-rotate-image-file)
        (if (or (and tumme-rotate-original-ask-before-overwrite
                     (y-or-n-p
                      "Rotate to temp file OK.  Overwrite original image? "))
                (not tumme-rotate-original-ask-before-overwrite))
            (progn
              (copy-file tumme-temp-rotate-image-file file t)
              (tumme-refresh-thumb))
          (tumme-display-image file))))))

(defun tumme-rotate-original-left ()
  "Rotate original image left (counter clockwise) 90 degrees."
  (interactive)
  (tumme-rotate-original "270"))

(defun tumme-rotate-original-right ()
  "Rotate original image right (clockwise) 90 degrees."
  (interactive)
  (tumme-rotate-original "90"))

(defun tumme-get-exif-file-name (file)
  "Use the image's EXIF information to return a unique file name.
The file name should be unique as long as you do not take more than
one picture per second.  The original file name is suffixed at the end
for traceability.  The format of the returned file name is
YYYY_MM_DD_HH_MM_DD_ORIG_FILE_NAME.jpg.  Used from
`tumme-copy-with-exif-file-name'."
  (let (data no-exif-data-found)
    (if (not (string-match "\.[Jj][Pp][Ee]?[Gg]$" (expand-file-name file)))
        (progn
          (setq no-exif-data-found t)
          (setq data
                (format-time-string
                 "%Y:%m:%d %H:%M:%S"
                 (nth 5 (file-attributes (expand-file-name file))))))
      (setq data (tumme-get-exif-data (expand-file-name file)
                                      "DateTimeOriginal")))
    (while (string-match "[ :]" data)
      (setq data (replace-match "_" nil nil data)))
    (format "%s%s%s" data
            (if no-exif-data-found
                "_noexif_"
              "_")
            (file-name-nondirectory file))))

(defun tumme-thumbnail-set-image-description ()
  "Set the ImageDescription EXIF tag for the original image.
If the image already has a value for this tag, it is used as the
default value at the prompt."
  (interactive)
  (if (not (tumme-image-at-point-p))
      (message "No thumbnail at point")
    (let* ((file (tumme-original-file-name))
           (old-value (tumme-get-exif-data file "ImageDescription")))
      (if (eq 0
              (tumme-set-exif-data file "ImageDescription"
                                   (read-string "Value of ImageDescription: "
                                                old-value)))
          (message "Successfully wrote ImageDescription tag.")
        (error "Could not write ImageDescription tag")))))

(defun tumme-set-exif-data (file tag-name tag-value)
  "In FILE, set EXIF tag TAG-NAME to value TAG-VALUE."
  (let (command)
    (setq command (format-spec
                   tumme-cmd-write-exif-data-options
                   (list
                    (cons ?p tumme-cmd-write-exif-data-program)
                    (cons ?f (expand-file-name file))
                    (cons ?t tag-name)
                    (cons ?v tag-value))))
    (call-process shell-file-name nil nil nil shell-command-switch command)))

(defun tumme-get-exif-data (file tag-name)
  "From FILE, return EXIF tag TAG-NAME."
  (let ((buf (get-buffer-create "*tumme-get-exif-data*"))
        command tag-value)
    (setq command (format-spec
                   tumme-cmd-read-exif-data-options
                   (list
                    (cons ?p tumme-cmd-read-exif-data-program)
                    (cons ?f file)
                    (cons ?t tag-name))))
    (with-current-buffer buf
      (delete-region (point-min) (point-max))
      (if (not (eq (call-process shell-file-name nil t nil
                                 shell-command-switch command) 0))
          (error "Could not get EXIF tag")
        (goto-char (point-min))
        ;; Clean buffer from newlines and carriage returns before
        ;; getting final info
        (while (search-forward-regexp "[\n\r]" nil t)
          (replace-match "" nil t))
        (setq tag-value (buffer-substring (point-min) (point-max)))))
    tag-value))

(defun tumme-copy-with-exif-file-name ()
  "Copy file with unique name to main image directory.
Copy current or all marked files in dired to a new file in your
main image directory, using a file name generated by
`tumme-get-exif-file-name'.  A typical usage for this if when
copying images from a digital camera into the image directory.

 Typically, you would open up the folder with the incoming
digital images, mark the files to be copied, and execute this
function.  The result is a couple of new files in
`tumme-main-image-directory' called
2005_05_08_12_52_00_dscn0319.jpg,
2005_05_08_14_27_45_dscn0320.jpg etc."
  (interactive)
  (let (new-name
        (files (dired-get-marked-files)))
    (mapcar
     (lambda (curr-file)
       (setq new-name
             (format "%s/%s"
                     (file-name-as-directory
                      (expand-file-name tumme-main-image-directory))
                     (tumme-get-exif-file-name curr-file)))
       (message "Copying %s to %s" curr-file new-name)
       (copy-file curr-file new-name))
     files)))

(defun tumme-display-next-thumbnail-original ()
  "In thubnail buffer, move to next thumbnail and display the image."
  (interactive)
  (tumme-forward-char)
  (tumme-display-thumbnail-original-image))

(defun tumme-display-previous-thumbnail-original ()
  "Move to previous thumbnail and display image."

  (interactive)
  (tumme-backward-char)
  (tumme-display-thumbnail-original-image))

(defun tumme-write-comment (file comment)
  "For FILE, write comment COMMENT in database."
  (save-excursion
    (let (end buf comment-beg)
      (setq buf (find-file tumme-db-file))
      (goto-char (point-min))
      (if (search-forward-regexp
           (format "^%s" file) nil t)
          (progn
            (end-of-line)
            (setq end (point))
            (beginning-of-line)
            ;; Delete old comment, if any
            (cond ((search-forward ";comment:" end t)
                   (setq comment-beg (match-beginning 0))
                   ;; Any tags after the comment?
                   (if (search-forward ";" end t)
                       (setq comment-end (- (point) 1))
                     (setq comment-end end))
                   ;; Delete comment tag and comment
                   (delete-region comment-beg comment-end)))
            ;; Insert new comment
            (beginning-of-line)
            (if (not (search-forward ";" end t))
                (progn
                  (end-of-line)
                  (insert ";")))
            (insert (format "comment:%s;" comment)))
        ;; File does not exist in databse - add it.
        (goto-char (point-max))
        (insert (format "\n%s;comment:%s" file comment)))
      (save-buffer)
      (kill-buffer buf))))

(defun tumme-write-comments (file-comments)
  "Write file comments to database.
Write file comments to one or more files.  FILE-COMMENTS is an alist on
the following form:
 ((FILE . COMMENT) ... )"
  (let (end comment-beg file comment)
    (with-temp-file tumme-db-file
      (insert-file-contents tumme-db-file)
      (dolist (elt file-comments)
        (setq file (car elt)
              comment (cdr elt))
        (goto-char (point-min))
        (if (search-forward-regexp (format "^%s.*$" file) nil t)
            (progn
              (setq end (point))
              (beginning-of-line)
              ;; Delete old comment, if any
              (when (search-forward ";comment:" end t)
                (setq comment-beg (match-beginning 0))
                ;; Any tags after the comment?
                (if (search-forward ";" end t)
                    (setq comment-end (- (point) 1))
                  (setq comment-end end))
                ;; Delete comment tag and comment
                (delete-region comment-beg comment-end))
              ;; Insert new comment
              (beginning-of-line)
              (unless (search-forward ";" end t)
                (end-of-line)
                (insert ";"))
              (insert (format "comment:%s;" comment)))
          ;; File does not exist in database - add it.
          (goto-char (point-max))
          (insert (format "\n%s;comment:%s" file comment)))))))

(defun tumme-update-property (prop value)
  "Update text property PROP with value VALUE at point."
  (let ((inhibit-read-only t))
    (put-text-property
     (point) (1+ (point))
     prop
     value)))

;;;###autoload
(defun tumme-dired-comment-files ()
  "Add comment to current or marked files in dired."
  (interactive)
  (let ((files (dired-get-marked-files))
         (comment (tumme-read-comment)))
    (mapcar
     (lambda (curr-file)
       (tumme-write-comment curr-file comment))
     files)))

(defun tumme-comment-thumbnail ()
  "Add comment to current thumbnail in thumbnail buffer."
  (interactive)
  (let* ((file (tumme-original-file-name))
         (comment (tumme-read-comment file)))
    (tumme-write-comment file comment)
    (tumme-update-property 'comment comment))
  (tumme-display-thumb-properties))

(defun tumme-read-comment (&optional file)
  "Read comment for an image.
Read comment for an image, optionally using old comment from FILE
as initial value."
  (let ((comment
         (read-string
          "Comment: "
          (if file (tumme-get-comment file)))))
    comment))

(defun tumme-get-comment (file)
  "Get comment for file FILE."
  (save-excursion
    (let (end buf comment-beg comment)
      (setq buf (find-file tumme-db-file))
      (goto-char (point-min))
      (when (search-forward-regexp
             (format "^%s" file) nil t)
        (end-of-line)
        (setq end (point))
        (beginning-of-line)
        (cond ((search-forward ";comment:" end t)
               (setq comment-beg (point))
               (if (search-forward ";" end t)
                   (setq comment-end (- (point) 1))
                 (setq comment-end end))
               (setq comment (buffer-substring
                              comment-beg comment-end)))))
      (kill-buffer buf)
      comment)))

;;;###autoload
(defun tumme-mark-tagged-files ()
  "Use regexp to mark files with matching tag.
A `tag' is a keyword, a piece of meta data, associated with an
image file and stored in tumme's database file.  This command
lets you input a regexp and this will be matched against all tags
on all image files in the database file.  The files that have a
matching tags will be marked in the dired buffer."
  (interactive)
  (let ((tag (read-string "Mark tagged files (regexp): "))
        (hits 0)
        files buf)
    (save-excursion
      (setq buf (find-file tumme-db-file))
      (goto-char (point-min))
      ;; Collect matches
      (while (search-forward-regexp
              (concat "\\(^[^;\n]+\\);.*" tag ".*$") nil t)
        (setq files (append (list (match-string 1)) files)))
      (kill-buffer buf)
      ;; Mark files
      (mapcar
       ;; I tried using `dired-mark-files-regexp' but it was
       ;; waaaay to slow.
       (lambda (curr-file)
         ;; Don't bother about hits found in other directories than
         ;; the current one.
         (when (string= (file-name-as-directory
                         (expand-file-name default-directory))
                      (file-name-as-directory
                       (file-name-directory curr-file)))
           (setq curr-file (file-name-nondirectory curr-file))
           (goto-char (point-min))
           (when (search-forward-regexp (format "\\s %s$" curr-file) nil t)
             (setq hits (+ hits 1))
             (dired-mark 1))))
       files))
    (message "%d files with matching tag marked." hits)))

(defun tumme-mouse-display-image (event)
  "Use mouse EVENT, call `tumme-display-image' to display image.
Track this in associated dired buffer if `tumme-track-movement' is
non-nil."
  (interactive "e")
  (let (file)
    (mouse-set-point event)
    (goto-char (posn-point (event-end event)))
    (setq file (tumme-original-file-name))
    (if tumme-track-movement
        (tumme-track-original-file))
    (tumme-create-display-image-buffer)
    (display-buffer tumme-display-image-buffer)
    (tumme-display-image file)))

(defun tumme-mouse-select-thumbnail (event)
  "Use mouse EVENT to select thumbnail image.
Track this in associated dired buffer if `tumme-track-movement' is
non-nil."
  (interactive "e")
  (let (file)
    (mouse-set-point event)
    (goto-char (posn-point (event-end event)))
    (if tumme-track-movement
        (tumme-track-original-file)))
  (tumme-display-thumb-properties))

(defun tumme-mouse-toggle-mark (event)
  "Use mouse EVENT to toggle dired mark for thumbnail.
Track this in associated dired buffer if `tumme-track-movement' is
non-nil."
  (interactive "e")
  (let (file)
    (mouse-set-point event)
    (goto-char (posn-point (event-end event)))
    (if tumme-track-movement
        (tumme-track-original-file)))
  (tumme-toggle-mark-thumb-original-file))

(defun tumme-dired-display-properties ()
  "Display properties for dired file in the echo area."
  (interactive)
  (let* ((file (dired-get-filename))
         (file-name (file-name-nondirectory file))
         (dired-buf (buffer-name (current-buffer)))
         (props (mapconcat
                 'princ
                 (tumme-list-tags file)
                 ", "))
         (comment (tumme-get-comment file)))
    (if file-name
        (message
         (tumme-format-properties-string
          dired-buf
          file-name
          props
          comment)))))

(defvar tumme-tag-file-list nil
  "List to store tag-file structure.")

(defvar tumme-file-tag-list nil
  "List to store file-tag structure.")

(defvar tumme-file-comment-list nil
  "List to store file comments.")

(defun tumme-add-to-tag-file-list (tag file)
  "Add relation between TAG and FILE."
  (let (curr)
    (if tumme-tag-file-list
        (if (setq curr (assoc tag tumme-tag-file-list))
            (if (not (member file curr))
                (setcdr curr (cons file (cdr curr))))
          (setcdr tumme-tag-file-list
                  (cons (list tag file) (cdr tumme-tag-file-list))))
      (setq tumme-tag-file-list (list (list tag file))))))

(defun tumme-add-to-tag-file-lists (tag file)
  "Helper function used from `tumme-create-gallery-lists'.

Add TAG to FILE in one list and FILE to TAG in the other.

Lisp structures look like the following:

tumme-file-tag-list:

  ((\"filename1\" \"tag1\" \"tag2\" \"tag3\" ...)
   (\"filename2\" \"tag1\" \"tag2\" \"tag3\" ...)
   ...)

tumme-tag-file-list:

 ((\"tag1\" \"filename1\" \"filename2\" \"filename3\" ...)
  (\"tag2\" \"filename1\" \"filename2\" \"filename3\" ...)
  ...)"
  ;; Add tag to file list
  (let (curr)
    (if tumme-file-tag-list
        (if (setq curr (assoc file tumme-file-tag-list))
            (setcdr curr (cons tag (cdr curr)))
          (setcdr tumme-file-tag-list
                  (cons (list file tag) (cdr tumme-file-tag-list))))
      (setq tumme-file-tag-list (list (list file tag))))
    ;; Add file to tag list
    (if tumme-tag-file-list
        (if (setq curr (assoc tag tumme-tag-file-list))
            (if (not (member file curr))
                (setcdr curr (cons file (cdr curr))))
          (setcdr tumme-tag-file-list
                  (cons (list tag file) (cdr tumme-tag-file-list))))
      (setq tumme-tag-file-list (list (list tag file))))))

(defun tumme-add-to-file-comment-list (file comment)
  "Helper function used from `tumme-create-gallery-lists'.

For FILE, add COMMENT to list.

Lisp structure looks like the following:

tumme-file-comment-list:

  ((\"filename1\" .  \"comment1\")
   (\"filename2\" .  \"comment2\")
   ...)"
  (if tumme-file-comment-list
      (if (not (assoc file tumme-file-comment-list))
          (setcdr tumme-file-comment-list
                  (cons (cons file comment)
                        (cdr tumme-file-comment-list))))
    (setq tumme-file-comment-list (list (cons file comment)))))

(defun tumme-create-gallery-lists ()
  "Create temporary lists used by `tumme-gallery-generate'."
  (let ((buf (find-file tumme-db-file))
        end beg file row-tags)
    (setq tumme-tag-file-list nil)
    (setq tumme-file-tag-list nil)
    (setq tumme-file-comment-list nil)
    (goto-char (point-min))
    (while (search-forward-regexp "^." nil t)
      (end-of-line)
      (setq end (point))
      (beginning-of-line)
      (setq beg (point))
      (if (not (search-forward ";" end nil))
          (error "Something is really wrong, check format of database"))
      (setq row-tags (split-string
                      (buffer-substring beg end) ";"))
      (setq file (car row-tags))
      (mapc
       (lambda (x)
         (if (not (string-match "^comment:\\(.*\\)" x))
             (tumme-add-to-tag-file-lists x file)
           (tumme-add-to-file-comment-list file (match-string 1 x))))
       (cdr row-tags)))
    (kill-buffer buf))
  ;; Sort tag-file list
  (setq tumme-tag-file-list
        (sort tumme-tag-file-list
              (lambda (x y)
                (string< (car x) (car y))))))

(defun tumme-hidden-p (file)
  "Return t if image FILE has a \"hidden\" tag."
  (let (hidden)
    (mapc
     (lambda (tag)
       (if (member tag tumme-gallery-hidden-tags)
           (setq hidden t)))
     (cdr (assoc file tumme-file-tag-list)))
    hidden))

(defun tumme-gallery-generate ()
  "Generate gallery pages.
First we create a couple of Lisp structures from the database to make
it easier to generate, then HTML-files are created in
`tumme-gallery-dir'"
  (interactive)
  (if (eq 'per-directory tumme-thumbnail-storage)
      (error "Currently, gallery generation is not supported \
when using per-directory thumbnail file storage"))
  (tumme-create-gallery-lists)
  (let ((tags tumme-tag-file-list)
        count curr tag index-buf tag-buf
        comment file-tags tag-link tag-link-list)
    ;; Make sure gallery root exist
    (if (file-exists-p tumme-gallery-dir)
        (if (not (file-directory-p tumme-gallery-dir))
            (error "Variable tumme-gallery-dir is not a directory"))
      (make-directory tumme-gallery-dir))
    ;; Open index file
    (setq index-buf (find-file
                     (format "%s/index.html" tumme-gallery-dir)))
    (erase-buffer)
    (insert "<html>\n")
    (insert "  <body>\n")
    (insert "   <h2>Tumme Gallery</h2>\n")
    (insert (format "<p>\n    Gallery generated %s\n   <p>\n"
                    (current-time-string)))
    (insert "   <h3>Tag index</h3>\n")
    (setq count 1)
    ;; Pre-generate list of all tag links
    (mapc
     (lambda (curr)
       (setq tag (car curr))
       (when (not (member tag tumme-gallery-hidden-tags))
         (setq tag-link (format "<a href=\"%d.html\">%s</a>" count tag))
         (if tag-link-list
             (setq tag-link-list
                   (append tag-link-list (list (cons tag tag-link))))
           (setq tag-link-list (list (cons tag tag-link))))
         (setq count (1+ count))))
     tags)
    (setq count 1)
    ;; Main loop where we generated thumbnail pages per tag
    (mapc
     (lambda (curr)
       (setq tag (car curr))
       ;; Don't display hidden tags
       (when (not (member tag tumme-gallery-hidden-tags))
         ;; Insert link to tag page in index
         (insert (format "    %s<br>\n" (cdr (assoc tag tag-link-list))))
         ;; Open per-tag file
         (setq tag-buf (find-file
                        (format "%s/%s.html" tumme-gallery-dir count)))
         (erase-buffer)
         (insert "<html>\n")
         (insert "  <body>\n")
         (insert "  <p><a href=\"index.html\">Index</a></p>\n")
         (insert (format "  <h2>Images with tag &quot;%s&quot;</h2>" tag))
         ;; Main loop for files per tag page
         (mapc
          (lambda (file)
            (when (not (tumme-hidden-p file))
              ;; Insert thumbnail with link to full image
              (insert
               (format "<a href=\"%s/%s\"><img src=\"%s/%s\"%s></a>\n"
                       tumme-gallery-image-root-url
                       (file-name-nondirectory file)
                       tumme-gallery-thumb-image-root-url
                       (file-name-nondirectory (tumme-thumb-name file)) file))
              ;; Insert comment, if any
              (if (setq comment (cdr (assoc file tumme-file-comment-list)))
                  (insert (format "<br>\n%s<br>\n" comment))
                (insert "<br>\n"))
              ;; Insert links to other tags, if any
              (when (> (length
                        (setq file-tags (assoc file tumme-file-tag-list))) 2)
                (insert "[ ")
                (mapc
                 (lambda (extra-tag)
                   ;; Only insert if not file name or the main tag
                   (if (and (not (equal extra-tag tag))
                            (not (equal extra-tag file)))
                       (insert
                        (format "%s " (cdr (assoc extra-tag tag-link-list))))))
                 file-tags)
                (insert "]<br>\n"))))
          (cdr curr))
         (insert "  <p><a href=\"index.html\">Index</a></p>\n")
         (insert "  </body>\n")
         (insert "</html>\n")
         (save-buffer)
         (kill-buffer tag-buf)
         (setq count (1+ count))))
       tags)
    (insert "  </body>\n")
    (insert "</html>")
    (save-buffer)
    (kill-buffer index-buf)))

(defun tumme-kill-buffer-and-window ()
  "Kill the current buffer and, if possible, also the window."
  (interactive)
  (let ((buffer (current-buffer)))
    (condition-case nil
        (delete-window (selected-window))
      (error nil))
    (kill-buffer buffer)))

(defvar tumme-widget-list nil
  "List to keep track of meta data in edit buffer")

;;;###autoload
(defun tumme-dired-edit-comment-and-tags ()
  "Edit comment and tags of current or marked image files.
Edit comment and tags for all marked image files in an
easy-to-use form."
  (interactive)
  (setq tumme-widget-list nil)
  ;; Setup buffer.
  (let ((files (dired-get-marked-files)))
    (switch-to-buffer "*Tumme Edit Meta Data*")
    (kill-all-local-variables)
    (make-local-variable 'widget-example-repeat)
    (let ((inhibit-read-only t))
      (erase-buffer))
    (remove-overlays)
    ;; Some help for the user.
    (widget-insert 
"\nEdit comments and tags for each image.  Separate multiple tags
with a comma.  Move forward between fields using TAB or RET.
Move to the previous field using backtab (S-TAB).  Save by
activating the Save button at the bottom of the form or cancel
the operation by activating the Cancel button.\n\n")
    ;; Here comes all images and a comment and tag field for each
    ;; image.
    (let (thumb-file img comment-widget tag-widget)

      (dolist (file files)

       (setq thumb-file (tumme-thumb-name file)
             img (create-image thumb-file))

       (insert-image img)
       (widget-insert "\n\nComment: ")
       (setq comment-widget
             (widget-create 'editable-field
                            :size 60
                            :format "%v "
                            :value (or (tumme-get-comment file) "")))
       (widget-insert "\nTags:    ")
       (setq tag-widget
             (widget-create 'editable-field
                            :size 60
                            :format "%v "
                            :value (or (mapconcat
                                        (lambda (tag)
                                          tag)
                                        (tumme-list-tags file)
                                        ",") "")))
       ;; Save information in all widgets so that we can use it when
       ;; the user saves the form.
       (setq tumme-widget-list 
             (append tumme-widget-list 
                     (list (list file comment-widget tag-widget))))
       (widget-insert "\n\n")))

    ;; Footer with Save and Cancel button.
    (widget-insert "\n")
    (widget-create 'push-button
                 :notify 
                 (lambda (&rest ignore)
                   (tumme-save-information-from-widgets)
                   (bury-buffer)
                   (message "Done."))
                 "Save")
    (widget-insert " ")
    (widget-create 'push-button
                   :notify 
                   (lambda (&rest ignore)
                     (bury-buffer)
                     (message "Operation canceled."))
                   "Cancel")
    (widget-insert "\n")
    (use-local-map widget-keymap)
    (widget-setup)
    ;; Jump to the first widget.
    (widget-forward 1)))

(defun tumme-save-information-from-widgets ()
  "Save information found in `tumme-widget-list'.
Use the information in `tumme-widget-list' to save comments and
tags to their respective image file.  Internal function used by
`tumme-dired-edit-comment-and-tags'."
  (mapc
   (lambda (x)
     (let ((file (car x))
           (comment (widget-value (cadr x)))
           (tags (widget-value (car (cddr x)))))
       (tumme-write-comment file comment)
       (mapc
        (lambda (tag)
          (tumme-write-tag file tag))
        (split-string tags ","))))
   tumme-widget-list))


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;; TEST-SECTION ;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;; (defvar tumme-dir-max-size 12300000)

;; (defun tumme-test-clean-old-files ()
;;   "Clean `tumme-dir' from old thumbnail files.
;; \"Oldness\" measured using last access time.  If the total size of all
;; thumbnail files in `tumme-dir' is larger than 'tumme-dir-max-size',
;; old files are deleted until the max size is reached."
;;   (let* ((files
;;           (sort
;;            (mapcar
;;             (lambda (f)
;;               (let ((fattribs (file-attributes f)))
;;                 ;; Get last access time and file size
;;                 `(,(nth 4 fattribs) ,(nth 7 fattribs) ,f)))
;;             (directory-files (tumme-dir) t ".+\.thumb\..+$"))
;;            ;; Sort function. Compare time between two files.
;;            '(lambda (l1 l2)
;;               (time-less-p (car l1) (car l2)))))
;;          (dirsize (apply '+ (mapcar (lambda (x) (cadr x)) files))))
;;     (while (> dirsize tumme-dir-max-size)
;;       (y-or-n-p
;;        (format "Size of thumbnail directory: %d, delete old file %s? "
;;                dirsize (cadr (cdar files))))
;;       (delete-file (cadr (cdar files)))
;;       (setq dirsize (- dirsize (car (cdar files))))
;;       (setq files (cdr files)))))

;;;;;;;;;;;;;;;;;;;;;;,

;; (defun dired-speedbar-buttons (dired-buffer)
;;   (when (and (boundp 'tumme-use-speedbar)
;;           tumme-use-speedbar)
;;     (let ((filename (with-current-buffer dired-buffer
;;                    (dired-get-filename))))
;;       (when (and (not (string-equal filename (buffer-string)))
;;               (string-match (image-file-name-regexp) filename))
;;      (erase-buffer)
;;      (insert (propertize
;;               filename
;;               'display
;;               (tumme-get-thumbnail-image filename)))))))

;; (setq tumme-use-speedbar t)

(provide 'tumme)

;; arch-tag: 9d11411d-331f-4380-8b44-8adfe3a0343e
;;; tumme.el ends here